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fsetpos() (Set File Position) in C

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The fsetpos() function moves the file position indicator of the given file stream to the specified position. When fsetpos() is executed, the end-of-file indicator is reset. fsetpos() function is a part of <cstdio> header file in C Standard Library.

Syntax of fsetpos()

int fsetpos(FILE *stream, const fpos_t *pos)

Parameters

  • stream – This is the pointer to a FILE object that identifies the stream.
  • position – This is the pointer to a fpos_t object containing the desired value of the position indicator.

Return Value

  • If it is successful, it returns zero otherwise returns a nonzero value.

C Program to Illustrate the use of fsetpos()

C




// C program to illustrate the use of fsetpos()
#include <stdio.h>
 
int main()
{
    // File pointer
    FILE* fp;
    // Variable to store file position
    fpos_t position;
 
    // Open file in write and read mode
    fp = fopen("myfile.txt", "w+");
 
    // Get current file position and store it
    fgetpos(fp, &position);
 
    // Write "HelloWorld!" to the file
    fputs("HelloWorld!", fp);
 
    // Set file position back to the stored position
    fsetpos(fp, &position);
 
    // Write "geeksforgeeks" to the file from the restored
    // position
    fputs("geeksforgeeks", fp);
 
    // setting file pointer position back to the stored
    // position
    fsetpos(fp, &position);
 
    // storing data stored in file
    char arr[50];
    fgets(arr, 14, fp);
 
    // printing output
    puts(arr);
 
    // Close the file
    fclose(fp);
 
    return (0);
}


Output

geeksforgeeks







Last Updated : 21 Sep, 2023
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